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Clinical features

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

There are three main presentations of Berry aneurysms:

  • 90% present with a subarachnoid haemorrhage

  • 7% present with symptoms of a space-occupying lesion:

  • internal carotid artery or anterior communicating artery aneurysms may compress:
    • pituitary stalk or hypothalamus causing hypopituitarism
    • the optic nerve or chiasm producing visual field defects

  • basilar artery aneurysm may compress the midbrain or pons to produce limb weakness or impaired eye movements

  • posterior communicating artery aneurysm may cause a III nerve palsy

  • intracavernous aneurysms may compress the III, IV, VI, trigeminal division of V and trigeminal ganglion to produce ophthalmoplegia and facial pain

  • 3% occur as incidental findings at autopsy

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